Service Instructions for No. 5, 6 & 8 AC Solenoid Assembly
Series 57,000; 67,000 and 77,000 Disc Brakes
®
Brake Replacement Parts
P/N 8-078-955-05
effective 8/20/99
Important
Please read these instructions carefully
before servicing your Stearns brake.
Failure to comply with these instructions
could cause injury to personnel and/or
damage to property if the brake is
serviced or operated incorrectly. For
definition of limited warranty/liability,
contact Rexnord Industries, Inc., Stearns
Division, 5150 S. International Dr., Cudahy,
Wisconsin 53110, (414) 272-1100.
Caution
1. Servicing shall be in compliance with
applicable local safety codes including
Occupational Safety and Health Act
(OSHA). All wiring and electrical
connections must comply with the
National Electric Code (NEC) and
local electric codes in effect.
2. To prevent an electrical hazard,
disconnect power source before
working on the brake. If power
disconnect point is out of sight, lock
disconnect in the
off position and tag to
prevent accidental application of power.
3. Be careful when touching the exterior
of an operating brake. Allow sufficient
time for the brake to cool before
disassembly. Surface may be hot
enough to be painful or cause injury.
4. Do not operate brake with housing
removed. All moving parts should be
guarded.
5. After usage, the brake interior will
contain burnt and degraded friction
material dust. This dust must be
removed before servicing or adjusting
the brake.
DO NOT BLOW OFF DUST using an air
hose. It is important to avoid dispersing
dust into the air or inhaling it, as this may
be dangerous to your health.
a) Wear a filtered mask or a respirator
while removing dust from the inside
of a brake.
b) Use a vacuum cleaner or a soft
brush to remove dust from the brake.
When brushing, avoid causing the
dust to become airborne. Collect the
dust in a container, such as a bag,
which can be sealed off.
6. Maintenance should be performed only
by qualified personnel familiar with the
construction and operation of the brake.
7. For proper performance and operation,
only genuine Stearns parts should be
used for repairs and replacements.
Warning! Any mechanism or load held in
position by the brake should be secured
to prevent possible injury to personnel or
damage to equipment before any
disassembly of the brake is attempted or
before the manual release knob or lever is
operated on the brake.
Instructions
1. To remove housing, follow instructions
listed under each individual brake series
in Figure 2, then continue with the
following steps.
2. Solenoid replacement can be
accomplished without removing the
support plate from brake.
3. Disconnect coil lead wires. Remove
three solenoid mounting screws (132)
and lock washers (132W) to free
solenoid frame (79).
4. Disconnect solenoid plunger (29) and
solenoid link (13) as follows:
a) On the 57,000 Series of 67,000 and
77,000 Series with No. 5 or No. 6
solenoids, remove cap screw (13C)
and nut (13N). Save for reuse later.
b) On the 67,000 and 77,000 Series
with No. 8 solenoid, remove one of
two cotter pins (13CP) and straight
pin (13P). Save pin (13P) for reuse
later.
57,000 Series
67,000 Series
77,000 Series
Remove two housing nuts (15) and
housing (7) by pulling back.
Remove four housing cap screws (15),
lock washers (15W) and housing (7)
by pulling back.
Remove four housing cap screws (15),
lock washers (15W) and housing (7)
by pulling back.
Figure 2
Item
No.
Item Description
Qty.
29
79
132W
132
*
132
Solenoid plunger
Solenoid frame
Solenoid mounting lock washer
Solenoid mounting screw
Solenoid mounting screw
1
1
3
1
3
*
For 57,000 Series only 3/8” long.
